http://llvm.org/bugs/show_bug.cgi?id=14797
Bug #: 14797
Summary: Analyzer gets confused by decrementing loops
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Static Analyzer
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Apparently the analyzers data flow analysis apparently gets confused by loops
which count downwards. Below is a small testcase, which works fine when the
first loop is changed to increment. As is the static analyzer claims
uninitialized values in the second loop;
#include <assert.h>
void foo(int len)
{
int a[5], b;
assert((len > 0) && (len <= 5));
for (int i = len-1; i >= 0; i--)
a[i] = 0;
for (int i = len-1; i >= 0; i--)
b = a[i];
}
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